Brake-shoe.



' No.'786,465. PATENTED APR. 4, 1905.

W. M. SIMPSON.

BRAKE SHOE.

APPLICATION FILED APR. 4, 1904.

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PATENTED APR. 4, 1905.

W. M. SIMPHSON.

BRAKE SHOE.

APPLICATION FILED APRA, 1904.

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PATENTED APR. 4, 1905.

W. M. SIMPSON.

BRAKE SHOE. APPLIUATIQN FILED APR.4, 1904.

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UNITED STATES Patented April 4, 1905.

PATENT OEEIcE.

WVILLIAM M. SIMPSON, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE RAIL- WAY MATERIALS COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

BRAKE-SHOE.

SPECIFICATION forming part of Letters Patent No. 786,465, dated April 4, 1905.

Application filed April 4:, 1904. Serial No. 201,469.

To all whom, it may concern.-

Be it known that 1, WILLIAM M. SInPsoN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Brake-Shoes, of which the following is a specification.

The objects of this invention are to provide a strong brake-shoe which will give the maximum degree of wear and to prevent the parts of the shoe from becoming detached 'andfalling upon the track in the event of a fracture.

In the accompanying drawings I have illustrated several forms in which the invention can be embodied.

Referring to the drawings, Figure 1 shows the invention embodied in a car brake-shoe, the outline of the shoe being indicated by broken lines. Fig. 2 is a top plan view. Figs. 3 and 4 are transverse sectional views of a brake-shoe, taken on the lines 3 3 and 4 4 of Fig. 2. Fig. 5 illustrates another form of the invention. Fig. 6 is a transverse sectional view on the line 6 6 of Fig. 5. Fig. 7 illustrates another form of embodying the invention. Fig. 8 is a transverse sectional view on the line 8 8 of Fig. 7 Figs. 9 to 12 illustrate strips of various kinds which may be used.

In the drawings like numerals of reference indicate corresponding parts in the several figures, and, referring thereto, 10 is the body of the shoe, which is shown in outline in Figs. 1, 2, 5. and 7 so that the construction of the backing will more readily appear. The shape and general character of the shoe may conform to that of the standard shoes or to any others, and the invention can be embodied in a driver-shoe or a car-shoe and in a solid castiron shoe or in a composite shoe. In the drawings I have shown a standard form of solid cast-iron car-shoe for simplicity.

The backing consists of one or more members, preferably made of some metal, such as malleable iron, which will not cut the tire of the wheel if it comes in contact therewith; but I may use cast-steel or other metal suitable for the purpose. I prefer that the members be transversely curved or rounded on their front faces. On Sheet 1 of the drawings I have shown a backing consisting of two members 11, arranged side by side and extending longitudinally of the shoe substantially throughout its length and located at the back of the shoe. Each of the members consists of a strip bent or cast to conform to the curvature of the shoe and provided on its back with one or more ribs 12, which stand up from the body of the member and may be exposed on the back of the finished shoe between the attaching-lug 13 and the brake-head guides 14. In the construction shown in Fig. 2 the backing members are cut out on one side at 15, so that the attaching-lug 13 will be united with the body of the shoe by suificient body metal to form a strong connection, and the ends of the members may have their outer corners cut off at 17, as shown.

Instead of employing a backing consisting of two members, as shown in Fig. 2, I may join these members together into a single member 11, as illustrated in Figs. 5, 6, and 12, or I may make the members in the form of two or more substantially straight strips 18, as shown in Figs. 7, 8, 9, and 11.

In the manufacture of brake-shoes embodying my invention the backing member is preferably laid in the mold with the ribbed side down and the body metal then poured into the mold. The rib on the backing member holds the body of the member above the bottom of the mold, so that the cast-iron to form the body of the shoe can flow around the edges of the backing member to securely unite the parts. The body metal may entirely envelop the back member except between the attaching-lug and the brake-head guides 14, where the rib rests upon the bottom of the mold. In this way the backing will be securely held in the body of the shoe at the extreme back thereof and enable the maximum degree of wear of the shoe before reaching the backing.

I-prefer to make the backing of malleable iron and cast it with the rib thereon in the required shape of the shoe. The rib will strengthen the backing, and thereby add to the strength of the shoe and tend to prevent fractures.

To prevent the lower end of the shoe in service from falling away from the remainderin case of fracture, I provide a shoulder at each end of the backing and on each of the members thereof when the backing is formed of two members. This shoulder is locked with the metal of the body of the shoe to make a locking engagement between the backing and the body, and it will prevent an end of the shoe from slipping off of the backing in case of fracture. I may provide the shoulders 19 on the upper side of the strips, as shown in Figs. 1, 2, 5, and 7, or shoulders 20 may be formed by dovetailing the side edges of the strips, as shown in Figs. 9 to 12. The shoulders may be otherwise formed, and I do not limit myself to the particular ways shown.

Without limiting myself to the exact construction and arrangement of parts herein shown anddescribed, what Iclaim, and desire to secure by Letters Patent, is-

1. A brake-shoe comprising a body, and a backing embedded in the body and provided on its back with one or more longitudinal ribs to support said backing in the mold while the body metal is being cast thereon so that the body metal may flow around the edges of the backing, said rib or ribs being exposed on the back of the shoe between the attaching-lug and the brake-head guides.

2. A brake-shoe comprising a body, and a backing embedded in the body at the back thereof and provided with a rib on its back, said backing being recessed in its side edges at the central portion thereof and having the corners at its ends cut away.

3. A brake-shoe comprising a body, and a backing provided at its ends with shoulders to make locking engagement with the body and on its back with a longitudinal rib.

4. A brake-shoe comprising a body, and a backing provided at its ends with shoulders formed by dovetailing its side edges and on its back with a longitudinal rib.

5. A brake-shoe comprising a body, and a back therefor provided with a transverselycurved front face and having a longitudinal rib on its back.

WILLIAM M. SIMPSON.

Witnesses:

(J. E. SMITH, M. L. GARRITY. 

